Culture or time period
- Thracian Classical period (480-323 BC)5
- Thracians (ca. 1000 BC-46 AD)7
- Thraco-Cimmerian (ca. 8th-7th century BC)8
- Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota31
- Three Kingdoms (220–280 AD)1
- Tibetan158
- Tibu (Tébu)2
- Ticuna2
- Tigre1
- Tillamook5
- Timurid dynasty (1370-1507)1
- Tindiga4
- Tingguian21
- Tipai-Ipai531
- Tiruray4
- Tiv65
- Tiwanaku empire (550-1000)60
- Tiwi people (N20)694
- Tjimundo2
- Tlachichíque (2500–2000 BC)1